package com.kuang.lock;

import java.util.concurrent.TimeUnit;

public class DeadLockDemo {
    public static void main(String[] args) {
        String lockA = "lockA";
        String lockB = "lockB";
        new Thread(new MyThread(lockA, lockB), "T1").start();
        new Thread(new MyThread(lockB, lockA), "T2").start();
    }
}
class MyThread implements Runnable{
    private String lockA;
    private String lockB;
    public MyThread(String lockA, String lockB) {
        this.lockA = lockA;
        this.lockB = lockB;
    }
    @Override
    public void run() {
        synchronized (lockA){
            /**解决问题
            1、使用 jps -l 定位进程号
            2、使用 jstack 进程号 找到死锁问题
            面试，工作中！ 排查问题：
            1、日志 9
            2、堆栈 1
             **/
            System.out.println(Thread.currentThread().getName() +
                    "lock:"+lockA+"=>get"+lockB);
            try {
                TimeUnit.SECONDS.sleep(2);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            synchronized (lockB){
                System.out.println(Thread.currentThread().getName() +
                        "lock:"+lockB+"=>get"+lockA);
            }
        }
    }
}
